#include <vector>
#include <iostream>

int main(){
    int a = 0;
    int &b = a;
    std::vector<int> v;

    while(a<20){
        v.push_back(b);
        a++;
    }
    std::cout << v.size() << std::endl;
    std::cout << v.at(13) << std::endl;
}